add superclasses to Applicative and Traversable

[ghc-base.git] / Data / Tree.hs

diff --git a/Data/Tree.hs b/Data/Tree.hs
index bc103b8..f2a55f5 100644 (file)
--- a/Data/Tree.hs
+++ b/Data/Tree.hs
@@ -28,7 +28,7 @@ module Data.Tree(
 import Prelude
 #endif
 
-import Control.Applicative (Applicative(..))
+import Control.Applicative (Applicative(..), (<$>))
 import Control.Monad
 import Data.Monoid (Monoid(..))
 import Data.Sequence (Seq, empty, singleton, (<|), (|>), fromList,